I hang a 15lb weight from my tripod (it has a hook to do this) and then set a 10 sec delay...does a good job removing the wobble when using a my 150-600mm tamron lens...
That's basically what I do too, but it's still tricky to adjust as there's no easy way to fine tune and it's still relying on that 1 screw so no matter how much weight you put it still wants to wobble at the mount point. You're basically loosing it up then manually moving it back and forth but when you let go it moves too much and you lose your spot etc. Huge pain. I had a telescope as a kid and it had these knobs you could turn to fine tune, need some kind of mechanism like that.
Or I might just actually buy a telescope that I can hookup a camera to, then all problems solved. Telescope stand is going to be more sturdy I imagine.
I also tried using two tripods, one on lens and one on camera to give me 2 points of contact, it was more sturdy, but much harder to adjust.